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Work to fit experimental dampers to the central span of London's infamous ú18M ($26M) Millennium Bridge has begun. Structural engineer Arup is funding the ú250,000 cost of the retrofit and a programme of trials designed to validate its proposed ú5M solution to the lateral sway problem that led to the landmark structure's embarrassing closure only days after it opened on 9 June.

Although Arup's proposals feature a unique combination of more than 60 viscous and tuned mass dampers, only one pair of 'chevron-braced' viscous dampers and a temporary TMD will be installed under the deck for the trials. Up to 300 members of Arup's staff will act as guinea pigs later this year, and a powerful new shaking machine has been installed.

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